(PECL radius >= 1.2.0)
radius_demangle — Demangles data
radius_demangle ( resource $radius_handle , string $mangled ) : string
Some data (Passwords, MS-CHAPv1 MPPE-Keys) is mangled for security reasons, and must be demangled before you can use them.
 Returns the demangled string, or false on error. 
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    https://www.php.net/manual/en/function.radius-demangle.php